721051684 has 12 divisors (see below), whose sum is σ = 1262734704. Its totient is φ = 360270344.

The previous prime is 721051673. The next prime is 721051693. The reversal of 721051684 is 486150127.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57454 + ... + 68869.

It is an arithmetic number, because the mean of its divisors is an integer number (105227892).

Almost surely, 2^721051684 is an apocalyptic number.

It is an amenable number.

721051684 is a deficient number, since it is larger than the sum of its proper divisors (541683020).

721051684 is a wasteful number, since it uses less digits than its factorization.

721051684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127754 (or 127752 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 721051684 is about 26852.4055533205. The cubic root of 721051684 is about 896.7171279043.

The spelling of 721051684 in words is "seven hundred twenty-one million, fifty-one thousand, six hundred eighty-four".